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Colemanite: Ca2B6O11·5(H2O)
Comments: Coarsely crystalline colemanite, in part, covered with minute acicular crystals of strontianite. Location: Boraxo #3 pit, Death Valley, California, USA. Scale: 30 cm. © Dave Barthelmy
Comments: Large crystals of brown colemanite with second generation of absolutely clear and gemmy (colorless) colemanite. Intensely fluorescent in long and short UV.. Location: Mustafakemalpascha Mine, West-Anatolia Turkey. Scale: Crystal size: 1.3 x 1 cm. © Fabre Minerals
Collinsite: Ca2(Mg,Fe++)(PO4)2·2(H2O)
Comments: Half nodule of nearly pure collinsite. The center of the specimen is a small piece of volcanic rock surrounded by collinsite. Location: Francois Lake, British Columbia, Canada. Scale: 7 x 5.5 cm. © John Veevaert
Coloradoite: HgTe
Comments: Massive, metallic coloradoite. Location: Kalgoorlie, Western Australia, Australia. Scale: 5x2.5x1.5 cm. © John Betts - Fine Minerals
Colquiriite: CaLiAlF6
Comments: Colorless tabular crystals of colquiriite on matrix. Location: Serra Branca pegmatite, Pedra Lavrada, Picuí, Paraíba, Northeast Region, Brazil. Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag
Columbite-(Fe): Fe++Nb2O6 Microcline: KAlSi3O8
Comments: Blocky, dark brown ferrocolumbite on pale greenish blue amazonite (microcline). Location: Crystal Park, El Paso Co., Colorado, USA. Scale: 2.5 x 1.5 cm. © Fabre Minerals
Columbite-(Fe): Fe++Nb2O6 Baotite: Ba4(Ti,Nb)8Si4O28Cl
Comments: Minute brown crystalline grains of baotite in dark ferrocolumbite (columbite-(Fe)). Location: Sheep Creek, Ravalli County, Montana. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Columbite-(Fe): Fe++Nb2O6 Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)
Comments: Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)). Location: Holdazan, Buregteg, Mongolia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Columbite-(Fe): Fe++Nb2O6
Comments: Dark, coaly black, weathered granular ferrocolumbite. This specimen was originally identified as samarskite-(Y) and corrected by Fred Davis who studied the locality. Location: Spinelli Samarskite Prospect, Glastonbury, Hartford Co., Connecticut, USA. Scale: Picture size 4 mm. © Paul M. Schumacher
Comments: Dark grains of columbite-(Fe) wtth small brown grains of fluorcarbonates of LREE. Corrected identificaton by Pavel M. Kartashov who analyzed this occurrence of 'chagbaiite'. Location: Round Top Rhyolite, Hudspeth County, Texas, USA. Scale: Picture Size 1 mm. © Thomas Witzke
Columbite-(Fe): Fe++Nb2O6 Upalite: Al(UO2)3(PO4)2O(OH)·7(H2O)
Comments: Thin translucent yellowish upalite crusts on a prismatic, black columbite crystal. Location: Thin translucent yellowish crusts on undifferntiated columbite crystal. Scale: Picture Size 2 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6
Comments: Small brown tabular crystals of manganocolumbite in a pegmatite. Location: Neuland Quarry, Döbschütz, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6 Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)
Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain. Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality. Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm. © Pavel M. Kartashov
Colusite: Cu12-13V(As,Sb,Sn,Ge)3S16 Arsenosulvanite: Cu3(As,V)S4
Comments: Bronzy, metallic tetragonal crystals of colusite (arsenosulvanite) in white marble. Location: Val Bona quarry, Carrara, Italy. Scale: Picture size 1 cm. © Dave Barthelmy
Colusite: Cu12-13V(As,Sb,Sn,Ge)3S16 Vinciennite: Cu10Fe4Sn(As,Sb)S16
Comments: Polished section (PPL) of a Fe-rich rim of vinciennite (vinc) on earlier colusite (col). Matrix is bornite (bn). Location: Kidd Creek Volcanogenic Massive Sulfide deposit, Western Abitibi Subprovince, Timmins, Ontario, Canada. Scale: Picture Size 0.5 mm. © National Resouces of Canada
Comancheite: Hg13(Cl,Br)8O9
Comments: Small orange crystals of comancheite on matrix. Location: Mariposa mine, Terlingua, Terlingua district, Brewster County, Texas, USA. Scale: Picture size 1.4 mm. © Thomas Witzke / Abraxas-Verlag
Combeite: Na2Ca2Si3O9
Comments: Crystalline cleavage fragment of combeite. Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Compreignacite: K2(UO2)6O4(OH)6·8(H2O)
Comments: Yellow crystals of compreignacite on matrix. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Congolite: (Fe++,Mg,Mn)3B7O13Cl
Comments: Pearly crystalline grains of congolite. Location: Brazzaville, Pool, Congo. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Conichalcite: CaCu(AsO4)(OH) Willemite: Zn2SiO4
Comments: Conichalcite with willemite. Location: Collected from the 30 level of the Tsumeb mine. Tsumeb, Namibia. Scale: 2.1 x 1.5 cm. © John Veevaert